Undated (AP) _ Silver and platinum futures gave up most of last week's sharp gains Monday amid fading expectations that President-elect Clinton will move quickly to stimulate the economy.

The white metals are particularly sensitive to economic signals because they have industrial uses. Gold and copper futures also slipped.

On other commodity markets, energy futures rose strongly; livestock and meat futures gained; and grains and soybeans were mixed.

Silver for December delivery plunged 17.8 cents on New York's Commodity Exchange to $3.702 a troy ounce. January platinum tumbled $6.40 to $357.80 a troy ounce on the New York Mercantile Exchange.

In other metal trading on the Commodity Exchange, December gold slid $3.10 to $333.10 a troy ounce; November copper fell $1.50 to 94.40 cents a pound.

Silver briefly topped $3.97 and platinum reached $368 late last week as Clinton's election fed speculation that he would immediately begin work on an economic plan.

But comments by Clinton and his advisers over the weekend and on Monday indicated they will take more time to study the problem than traders expected. Senior Clinton aides said Monday it was unlikely that Clinton could convene an economic summit with business leaders before Thanksgiving.

''The reality has set in that a quick fix for the economy is not around the corner,'' said Peter Cardillo, research director with Westfalia Investments Inc.

Martin Reichenberg, manager of trading services with Pegasus Econometric Group in Hoboken, N.J., said slower movement on an economic revival plan infers less likelihood of a spurt in inflation, which was another factor in Monday's trading. Investment demand for precious metals tends to rise with inflation.

Bernard Savaiko, senior metals analyst with PaineWebber Inc. in New York, attributed silver's plunge largely to technical factors, including the market's failure to hold above $3.85 an ounce.

''When we cracked that, it was like someone dropped a stone straight down,'' he said.

But Savaiko said the plunge brought silver down to an attractive price for industrial buyers and he did not expect much more erosion in the near term.

Crude oil futures rose strongly on the New York Mercantile Exchange on speculation that the Organization of Petroleum Exporting Countries may try to rein in production and halt a month-long slide in prices.

OPEC's oil production averaged 25.25 million barrels a day in October, a rise of 325,000 barrels over the September total, the Middle East Economic Survey reported Monday.

Light sweet crude oil for December delivery rose 32 cents to $20.62 a barrel; December heating oil climbed .98 cent to 58.36 cents a gallon; December unleaded gasoline rose .15 cent to 56.23 cents a gallon; December natural gas rose 0.9 cent to $2.354 per 1,000 cubic feet.

Stronger cash cattle prices prompted sharp gains in cattle futures prices on the Chicago Mercantile Exchange. The rally spilled over into the hog and pork belly pits, were prices also were supported for expectations for stronger cash hog markets.

Live cattle for December delivery rose .70 cent to 74.22 cents a pound; November feeder cattle climbed .95 cent to 84.20 cents a pound; December live hogs rose .38 cent to 43.25 cents a pound; February frozen pork bellies rose .38 cent to 41.85 cents a pound.

Wheat futures rose modestly but corn and soybean futures ended slightly lower on the Chicago Board of Trade.

Export hopes continued to support the wheat market, which posted a moderate gain last week after a sale of 2 million metric tons of U.S. wheat to China.

Corn and soybean prices were pressured by expectations that the Agriculture Department will raise its production estimates for those crops in a report due out after the close of trading Tuesday.

December wheat rose 3 1/2 cents to $3.62 3/4 a bushel; December corn fell 1 1/2 cents to $2.06 1/2 a bushel; December oats rose 1 cent to $1.36 a bushel; November soybeans slipped 2 cents to $5.49 1/4 a bushel.